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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
V S
7V TO 24V
DIN1
C IN
4.7 F F
R EXT
200k I
OPTIONAL
P
Q1
L1
10 F H
D1
C1
2.2 F F
C2
2.2 F F
VCCA 5V
0.1 F F
1 F F
V CC
IN
FAULT
LX
PGND
R1
2.21M I
R ISET
50k I
R DFSET
250k I
ISET
DFSET
EN
OVP
R2
71.5k I
MAX17105
R OSC
100k I
R COMP
5.1k I
C COMP2 C COMP1
0.022 F F 220pF
OSC
COMP
FB1
FB2
FB3
FB4
SMBus
INTERFACE
10kHz
C PWMO
1 F F
SDA
SCL
PWMI
PWMO
SGND
EP
FB5
FB6
FB7
FB8
Figure 1. Typical Operating Circuit
Table 1. Component List
Table 2. Component Suppliers
DESIGNATION
White LED
L1
Q1 (Optional)
C IN
DESCRIPTION
Nichia NSSW008C 3.2V (typ), 3.5V
(max) at 20mA
10 F H, 1.5A, H = 1.2mm
TDK VLP6812T-100M1R5
30V, 65m I p-channel MOSFET
Si3481DV
FDC658AP
4.7 F F Q 10%, 25V X5R ceramic
capacitor (1206)
Murata GRM319R61E475KA12D
SUPPLIER
Fairchild
Semiconductor
Murata
Nichia Corp.
TDK Corp.
Toshiba
America
Electronic
Components,
Inc.
Vishay
PHONE
888-522-5372
770-436-1300
248-352-6575
847-803-6100
949-623-2900
402-563-6866
WEBSITE
www.fairchildsemi.com
www.murata-northamerica.com
www.nichia.com
www.component.tdk.com
www.toshiba.com/taec
www.vishay.com
2.2 F F Q 20%, 50V X7R ceramic
C1, C2
D1
capacitors (1206)
Murata GRM31CR71H225K
2A, 40V Schottky diode (M-flat)
Toshiba CMS11
Detailed Description
The MAX17105 typical operating circuit is shown in
Figure 1. Table 1 lists some recommended components,
and Table 2 lists the contact information of component
suppliers.
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